:root {
  --paper: #fcfbf8;
  --ink: #211e18;
  --muted: #8a8578;
  --ruby: #9b968a;
  --accent: #897024;
  --rule: rgba(33, 30, 24, 0.14);
  --ghost: rgba(33, 30, 24, 0.045);
  --chrome-z: 30;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: "Shippori Mincho", "Noto Serif JP", serif;
  transition: background-color 900ms ease, color 700ms ease;
}

body.dark-mode {
  --ink: #f1eee5;
  --muted: #aaa79e;
  --ruby: #aaa79e;
  --accent: #d6b965;
  --rule: rgba(241, 238, 229, 0.16);
  --ghost: rgba(241, 238, 229, 0.045);
}

button,
a {
  color: inherit;
}

button {
  font: inherit;
}

a {
  text-decoration: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 40;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitchTiles'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='.035'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  opacity: 0.44;
  pointer-events: none;
}

body.dark-mode .grain {
  mix-blend-mode: soft-light;
  opacity: 0.28;
}

.chrome-top,
.chrome-foot {
  position: fixed;
  left: 0;
  right: 0;
  z-index: var(--chrome-z);
  display: flex;
  justify-content: space-between;
  pointer-events: none;
}

.chrome-top {
  top: 0;
  align-items: center;
  padding: 30px 44px;
}

.chrome-foot {
  bottom: 0;
  align-items: flex-end;
  padding: 30px 44px;
}

.wordmark,
.archive-link,
.readings-toggle,
.x-link {
  pointer-events: auto;
}

.site-actions {
  display: flex;
  align-items: center;
  gap: 22px;
}

.archive-link {
  color: var(--muted);
  font-family: "Noto Serif JP", serif;
  font-size: 0.76rem;
  letter-spacing: 0.18em;
  transition: color 220ms ease;
}

.readings-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 2px 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-family: "Noto Serif JP", serif;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: color 180ms ease;
}

.readings-toggle::after {
  display: inline-block;
  width: 22px;
  height: 12px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background:
    radial-gradient(circle at 6px 50%, currentColor 0 3px, transparent 3.6px);
  content: "";
  opacity: 0.7;
  transition: background-position 180ms ease, opacity 180ms ease;
}

.readings-toggle:hover,
.readings-toggle:focus-visible {
  color: var(--accent);
}

.readings-toggle[aria-pressed="true"]::after {
  background:
    radial-gradient(circle at 16px 50%, #fff 0 3px, transparent 3.6px),
    currentColor;
  opacity: 0.82;
}

.archive-link:hover,
.archive-link:focus-visible {
  color: var(--ink);
}

.wordmark {
  font-size: 1.15rem;
  letter-spacing: 0.32em;
  white-space: nowrap;
}

.wordmark::after {
  display: block;
  width: 0;
  height: 1px;
  margin-top: 5px;
  background: currentColor;
  content: "";
  opacity: 0.5;
  transition: width 300ms ease;
}

.wordmark:hover::after,
.wordmark:focus-visible::after {
  width: calc(100% - 0.32em);
}

.sig {
  display: flex;
  flex-direction: column;
  gap: 5px;
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.61rem;
  letter-spacing: 0.15em;
  line-height: 1.65;
}

.x-link:hover,
.x-link:focus-visible {
  color: var(--ink);
}

.hint {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.6rem;
  letter-spacing: 0.34em;
  writing-mode: vertical-rl;
}

.hint-line {
  display: block;
  width: 1px;
  height: 29px;
  background: currentColor;
  opacity: 0.35;
  animation: hint-pulse 2.8s ease-in-out infinite;
}

@keyframes hint-pulse {
  0%,
  100% {
    transform: scaleY(0.55);
    transform-origin: top;
  }
  50% {
    transform: scaleY(1);
    transform-origin: top;
  }
}

.track {
  position: relative;
}

.leaf {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  align-items: center;
  overflow: hidden;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  isolation: isolate;
}

.leaf-inner {
  position: relative;
  z-index: 2;
  display: flex;
  width: 100%;
  max-width: 1240px;
  flex-direction: column;
  gap: clamp(24px, 3.4vh, 44px);
  margin: 0 auto;
  padding: 0 clamp(44px, 12vw, 220px);
}

.intro-inner {
  align-items: flex-start;
}

.intro-title {
  margin: 0;
  font-size: clamp(3rem, 9vw, 7rem);
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: normal;
}

.sub {
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-family: "Noto Serif JP", serif;
  font-size: 1.05rem;
  font-weight: 300;
  letter-spacing: 0.3em;
}

.count {
  margin: 2.4rem 0 0;
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

.intro-links {
  display: flex;
  gap: 10px;
  margin-top: 1.2rem;
  color: var(--muted);
  font-family: "Noto Serif JP", serif;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.intro-links a,
.poem-links a {
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 0.32em;
  transition: color 220ms ease, text-decoration-color 220ms ease;
}

.intro-links a:hover,
.intro-links a:focus-visible,
.poem-links a:hover,
.poem-links a:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.ghost {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: clamp(-2vw, 2vw, 6vw);
  color: var(--ghost);
  font-size: 46vh;
  font-weight: 600;
  line-height: 1;
  pointer-events: none;
  transform: translateY(-48%);
  user-select: none;
}

.meta-top {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 700ms ease 80ms, transform 700ms ease 80ms;
}

.place {
  font-size: 1.4rem;
  letter-spacing: 0.12em;
}

.date-jp {
  color: var(--muted);
  font-family: "Noto Serif JP", serif;
  font-size: 0.9rem;
  font-weight: 300;
  letter-spacing: 0.14em;
}

.poem {
  display: flex;
  flex-direction: column;
  gap: clamp(6px, 1vh, 14px);
  width: 100%;
}

.line {
  color: var(--ink);
  font-size: clamp(2.2rem, 6.4vw, 5rem);
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1.28;
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 780ms ease, transform 780ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

.line.l2 {
  margin-left: clamp(1.4rem, 4vw, 4rem);
}

.line.l3 {
  margin-left: clamp(2.8rem, 8vw, 8rem);
}

ruby {
  ruby-align: center;
  ruby-position: over;
}

rt {
  color: var(--ruby);
  font-family: "Noto Serif JP", serif;
  font-size: 0.72rem;
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1.1;
}

.readings-hidden .reading-ruby rt {
  display: none;
}

.kigo-inline {
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.14em;
  text-decoration-skip-ink: auto;
}

.kigo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 700ms ease 560ms, transform 700ms ease 560ms;
}

.kigo-mark {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.kw {
  color: var(--accent);
  font-family: "Shippori Mincho", serif;
  font-size: 1rem;
  letter-spacing: 0.1em;
}

.kigo-label {
  opacity: 0.72;
}

.poem-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.25rem;
  color: var(--muted);
  font-family: "Noto Serif JP", serif;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 700ms ease 640ms, transform 700ms ease 640ms;
}

.leaf.in .meta-top,
.leaf.in .line,
.leaf.in .kigo,
.leaf.in .poem-links {
  opacity: 1;
  transform: translateY(0);
}

.leaf.in .line.l1 {
  transition-delay: 150ms;
}

.leaf.in .line.l2 {
  transition-delay: 270ms;
}

.leaf.in .line.l3 {
  transition-delay: 390ms;
}

.rail {
  position: fixed;
  z-index: var(--chrome-z);
  top: 90px;
  right: 28px;
  bottom: 90px;
  display: flex;
  width: 84px;
  flex-direction: column;
  align-items: flex-end;
  gap: 11px;
  overflow: hidden;
  pointer-events: auto;
  scrollbar-width: none;
}

.rail::-webkit-scrollbar {
  display: none;
}

.rail-tick {
  display: flex;
  min-height: 14px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.rail-num {
  min-width: 19px;
  font-family: "Space Mono", monospace;
  font-size: 0.55rem;
  opacity: 0;
  transition: opacity 220ms ease;
}

.bar {
  display: block;
  width: 14px;
  height: 1px;
  background: currentColor;
  opacity: 0.2;
  transition: width 280ms ease, opacity 280ms ease, background-color 500ms ease;
}

.rail-tick:hover .rail-num,
.rail-tick:focus-visible .rail-num,
.rail-tick.active .rail-num {
  opacity: 0.8;
}

.rail-tick:hover .bar,
.rail-tick:focus-visible .bar {
  width: 22px;
  opacity: 0.55;
}

.rail-tick.active .bar {
  width: 40px;
  background: var(--accent);
  opacity: 0.72;
}

.load-status {
  position: fixed;
  z-index: 50;
  left: 50%;
  bottom: 2rem;
  margin: 0;
  color: var(--muted);
  font-family: "Space Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%);
}

.load-status.error {
  opacity: 1;
}

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 5px;
}

@media (max-width: 760px) {
  .chrome-top {
    padding: 22px;
  }

  .chrome-foot {
    padding: 20px 22px;
  }

  .wordmark {
    font-size: 1.05rem;
    letter-spacing: 0.28em;
  }

  .site-actions {
    gap: 10px;
  }

  .archive-link {
    font-size: 0.66rem;
    letter-spacing: 0.08em;
  }

  .readings-toggle {
    font-size: 0.64rem;
    letter-spacing: 0.05em;
  }

  .leaf-inner {
    gap: clamp(22px, 3vh, 26px);
    padding: 0 24px;
  }

  .intro-inner {
    padding-bottom: 0;
  }

  .intro-title {
    font-size: clamp(3rem, 9vw, 7rem);
    letter-spacing: 0.2em;
  }

  .sub {
    margin-top: 1rem;
    font-size: 0.88rem;
    letter-spacing: 0.26em;
  }

  .count {
    margin-top: 2rem;
    font-size: 0.58rem;
    letter-spacing: 0.18em;
  }

  .intro-links {
    margin-top: 0.9rem;
    font-size: 0.64rem;
  }

  .ghost {
    top: 50%;
    right: clamp(-2vw, 2vw, 6vw);
    font-size: 42vh;
    transform: translateY(-50%);
  }

  .meta-top {
    gap: 1rem;
    margin-bottom: 0.5rem;
  }

  .place {
    font-size: 1.4rem;
  }

  .date-jp {
    font-size: 0.82rem;
    letter-spacing: 0.1em;
  }

  .poem {
    gap: clamp(10px, 1.5vh, 14px);
  }

  .line {
    font-size: clamp(2.2rem, 10.4vw, 2.9rem);
    letter-spacing: 0.04em;
    line-height: 1.3;
  }

  .line.l2 {
    margin-left: 1.1rem;
  }

  .line.l3 {
    margin-left: 2.2rem;
  }

  .kigo-inline {
    text-decoration-thickness: 1.5px;
  }

  .kigo {
    gap: 0.65rem;
    font-size: 0.62rem;
  }

  .kw {
    font-size: 0.95rem;
  }

  .poem-links {
    max-width: calc(100% - 36px);
    gap: 0.55rem 0.9rem;
    font-size: 0.64rem;
  }

  .rail {
    top: 92px;
    right: 12px;
    bottom: 92px;
    width: 32px;
    gap: 9px;
  }

  .rail-num {
    display: none;
  }

  .bar {
    width: 10px;
  }

  .rail-tick.active .bar {
    width: 26px;
  }

  .hint {
    display: none;
  }

  .sig {
    font-size: 0.58rem;
  }
}

@media (max-width: 370px) {
  .chrome-top .wordmark {
    display: none;
  }

  .chrome-top {
    justify-content: flex-end;
  }

  .leaf-inner {
    padding: 0 18px;
  }

  .line.l2 {
    margin-left: 1rem;
  }

  .line.l3 {
    margin-left: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}